PGT Home Additions & ADU Nationwide

PGT Home Additions & ADU: The San Antonio Owner’s Guide

If you’re searching for “PGT home additions & ADU in San Antonio,” you’re likely planning a structural addition and want to know whether your existing PGT windows, doors, or exterior envelope will integrate cleanly with the new build. A home addition or ADU in San Antonio typically runs $45,000 to $130,000 for the full scope, depending on square footage, foundation work, and finish level. We handle the framing, tie-ins, and integration of PGT products so the new structure doesn’t leak, rack, or fight the old one. Most owners discover they need help at the point where the new roofline meets the existing wall, or when the PGT window package they ordered doesn’t match the framing openings.

Call (254) 269-5071

Written by Isaac Pruett, Owner, Mason Remodeling Co San Antonio, serving San Antonio and nearby areas. Call (254) 269-5071 for a free estimate.

Key Takeaways

• Home additions in San Antonio cost $45,000 to $130,000 installed; ADU construction runs $90,000 to $220,000.
• PGT windows and doors require exact rough opening dimensions – a half-inch error means re-framing or re-ordering.
• San Antonio’s expansive clay soil means foundation work is the first thing we inspect on any addition.
• We are an independent contractor, not affiliated with PGT, but we install and integrate PGT products daily.
• Written price before any work starts, and a 365-Day Done Right Promise on the completed job.

Which PGT Models This Applies To

PGT manufactures window and door lines across several series – WinGuard, SpectraGuard, and the Eze-Breeze porch enclosure line are the ones we see most often on San Antonio additions and ADUs. WinGuard is PGT’s impact-rated line; SpectraGuard is their standard energy-efficient vinyl; Eze-Breeze is the sliding vinyl panel system used on screened porches and sunrooms. The compatibility gotcha most homeowners hit is rough opening size: PGT builds to order, so a window ordered for a 36×48 rough opening won’t drop into a 35-7/8 framed hole. We measure every opening before ordering, and we frame additions to match the PGT spec sheet, not the other way around.

For the OEM-versus-aftermarket decision: PGT glass and frames are proprietary dimensions. There’s no generic aftermarket sash that drops into a PGT frame reliably. We order OEM PGT units for repair or new construction when the existing product is being extended. For non-structural trim, flashing, and sealants around PGT openings, we use spec-grade equivalents – but the window or door itself is OEM.

Signs Your PGT Home Addition or ADU Is Failing

• Water staining at the tie-in point. The junction where new framing meets the old wall is the most common failure we see. If flashing was skipped or taped incorrectly, water rides the seam down into the wall cavity. By the time you see the stain, the sheathing has usually been wet for months.
• Doors that stick only in summer. San Antonio clay soil swells when wet and shrinks when dry. A door that binds in July but works fine in January means the addition’s foundation is moving differently from the original slab.
• Cracks at inside corners higher than hairline. A thin crack at a drywall corner is normal settling. A crack you can fit a quarter into at the corner of a new room means the structure is racking and something in the framing or foundation wasn’t right.
• Condensation or fog between PGT panes. Failed seals on older PGT units allow moisture between the glass. In San Antonio’s humidity swings, a failed seal shows up fast. This is a glass replacement, not a window replacement, and PGT units can often be reglazed.
• Energy bills that climbed after the addition was built. If the new HVAC ducting wasn’t sized for the added square footage, or the PGT units weren’t flashed properly, the addition leaks air. We find undersized ducts in roughly half the additions we inspect in San Antonio.

Replacement Cost & What’s Included

Home additions in San Antonio run $45,000 to $130,000. The range moves on square footage, foundation type, roofline complexity, and finish level. ADU construction runs $90,000 to $220,000 because an ADU is a full standalone structure – kitchen, bath, separate electric panel, separate water and sewer taps. A garage conversion is the lower-cost path at $30,000 to $80,000, but the HVAC, insulation, and floor leveling still have to be done right or the room is miserable in August.

Every project gets a written price before any work starts – not a verbal ballpark, not an estimate that grows. The written price covers permits, framing, foundation work, PGT window and door installation, roofing tie-in, drywall, paint, and final walkthrough. We itemize the line items so you see exactly where the money goes. If the scope changes because we find something unexpected in the wall or under the slab, we write a change order, price it, and get your approval before touching it. The 365-Day Done Right Promise covers the workmanship for a full year from completion – if something isn’t right, we return and make it right at no cost.

DIY or Call Us?

What you can safely do yourself: measure your existing PGT window and door openings, note the model stamps on the frame corners, and photograph any water staining or cracking you see. That information helps us give you a written price faster. What you should not do: cut into load-bearing walls, remove an existing PGT window to try to widen the opening, or pour a foundation pad for an ADU. In San Antonio, the clay soil means pad thickness and rebar spacing are structural decisions, not cosmetic ones. A crew that pours a 4-inch slab where 6 inches was needed will watch the ADU crack within two years. Framing a roof tie-in wrong pulls the old roof apart. This is where DIY gets expensive fast. Call (254) 269-5071 and we’ll walk the property with you, measure everything, and hand you a written price.

FAQs